“There's a theory about how the trucks and pallets need to be packed," Bodge said. "They need to be in a certain shape, for instance, in that truck so things don't move, so sometimes it makes sense to put a small item in a big box so it all fits together."

The speed of fulfilling orders may be another possible explanation, she said.

"We've all become accustomed to receiving our packages in lightning speed, so when packages are being packed that quickly, there are bound to be mistakes," Bodge said.